Mercury ion rapidly absorbing composite sponge absorbent and preparation and application methods thereof

The technology of composite sponge and adsorbent is applied in the field of preparation of composite sponge adsorbent, which can solve the problems of high price, low selectivity, difficult recovery and the like, and achieve the effects of low price, low preparation cost and environmental friendliness.

Active Publication Date: 2019-02-22
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the shortcomings of traditional adsorbents (such as activated carbon, molecular sieve, clay, etc.) such as difficulty in recovery, low selectivity, and high price, the development of adsorption-type sponge materials is of great significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. Add cellulose to water, prepare a 7% suspension through high-speed dispersion, and set aside;

[0021] B, chitosan is dissolved in 1% acetic acid solution, is mixed with 2% chitosan solution, for subsequent use;

[0022] c. Dissolve polyvinyl alcohol in water to prepare a 10% polyvinyl alcohol solution for subsequent use;

[0023] d. Add 50% of the chitosan solution in step b and 5% of the polyvinyl alcohol solution obtained in step c to 7.5% of the cellulose suspension in step a according to the mass fraction, and after stirring mechanically for 4 hours at a water bath temperature of 30° C., add 5% of the mixture % crosslinking agent glutaraldehyde, continue to stir for 6h;

[0024] e. After freeze-drying the cross-linked product formed in step d for 12 hours, soak it with 0.5mol / L sodium hydroxide for 12 hours, and wash it with ethanol and deionized water to neutrality, and then freeze-dry to obtain the composite sponge adsorbent. The specific surface area of ​​t...

Embodiment 2

[0027] a. Add lignin into water, prepare a 3% suspension through high-speed dispersion, and set aside;

[0028] b. Dissolving chitin in 2% acetic acid solution to prepare a 20% chitin solution for subsequent use;

[0029] c. Dissolve polyvinyl alcohol in water to prepare a 5% polyvinyl alcohol solution for subsequent use;

[0030] d. Add 30% of the chitin solution obtained in step b and 10% of the polyvinyl alcohol solution in step c to the 15% lignin suspension in step a according to the mass fraction, and after mechanically stirring for 6 hours at a water bath temperature of 25°C, add 1% of the mixture The cross-linking agent epoxy chlorohydrin, continue to stir 8h;

[0031] e. After freeze-drying the cross-linked product formed in step d for 18 hours, soak it with 1.0mol / L sodium hydroxide for 10 hours, and wash it with ethanol and deionized water to neutrality, and then freeze-dry to obtain the composite sponge adsorbent. The specific surface area of ​​the adsorbent is 1...

Embodiment 3

[0034] a. Add wheat gluten powder into water, prepare a 5% suspension through high-speed dispersion, and set aside;

[0035] b. Dissolving chitin in 3% acetic acid solution to prepare 10% chitin solution for subsequent use;

[0036] c. Polyethylene glycol is dissolved in water, and a 4% polyethylene glycol solution is prepared for subsequent use;

[0037] d. Add 15% of the chitin solution obtained in step b and 8% of the polyethylene glycol solution in step c to the 30% suspension of wheat protein powder in step a according to the mass fraction, and after stirring mechanically for 10 hours at a water bath temperature of 20°C, add the chitin solution into the mixture 10% cross-linking agent genipin, continue to stir for 10h;

[0038] e. After freeze-drying the cross-linked product formed in step d for 20 hours, soak it with 1.5mol / L sodium hydroxide for 8 hours, and wash it with ethanol and deionized water to neutrality, and freeze-dry to obtain the composite sponge adsorbent....

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PUM

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Abstract

The invention relates to a composite sponge absorbent capable of rapidly and efficiently absorbing mercury ions in aqueous solution and preparation and application methods thereof. The preparation method comprises taking cellulose, lignin and wheat protein powder, which are low in price and easy to acquire, as base materials, performing high-speed dispersion to obtain a suspension, then adding inchitosan, chitin and polyvinyl alcohol or polyethylene glycol of different quantities, and through a simple crosslinking and freeze-drying combined method, preparing the compound sponge absorbent. Overall preparation processes are implemented in aqueous solution and accordingly are simple in processes and operation without special technical equipment, thereby being low in cost. The prepared compound sponge absorbent is rapid in absorbing speed, high in selective absorption to mercury ions, low in influence of pH, recyclable, green and environmentally friendly, thereby having a good applicationprospect during practical heavy metal wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of water heavy metal treatment, and relates to the preparation of a composite sponge adsorbent for quickly and efficiently removing mercury ions in aqueous solution. Background technique [0002] Environmental pollution caused by toxic heavy metal ions in industrial wastewater has attracted more and more attention. Heavy metal ion pollution in water includes waste water produced in industrial production processes such as mining, metallurgy, and chemical industry. Heavy metals such as mercury, cadmium, lead, and copper exceeding the standard are particularly serious because they are highly toxic at low concentrations and must be discharged before discharge. Pollutants handled. Among these heavy metal ions, mercury ions are considered to be the most dangerous. Because inorganic mercury ions in water can be converted into highly toxic methylmercury through the action of microorganisms, and after a large amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/267C02F1/285C02F2101/20
Inventor 王兰张丹王传义
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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